The ECpH-9853 dual-parameter testing pen integrates pH, EC and temperature testing in one compact device, eliminating the need for separate meters to cut testing costs and simplify on-site sampling. It covers a full measuring range of 0.00–14.00 pH and 0–9990µS/cm EC, delivering stable ±2% testing accuracy supported by built-in ATC automatic temperature compensation to offset reading deviations caused by fluctuating liquid temperatures. The split dual LCD screen displays two core values simultaneously, equipped with data hold, low-battery reminder and 8-minute auto shutoff to extend battery service life. It supports one-button automatic two-point pH calibration and single-point EC calibration with standard solutions, friendly for beginners and lab staff. Made of splash-proof lightweight ABS plastic with a detachable protective probe cap, this ergonomic pen-style tester is easy to store and carry. Widely applied in hydroponic cultivation, aquarium care, drinking water filtration, swimming pool maintenance, laboratory reagent preparation and light industrial wastewater inspection. Pre-calibrated before delivery, it comes with matching button batteries for instant use, a reliable daily water quality monitoring tool for household growers and professional technicians.